EV2149-J-00A–6V, DUAL 1A LOW QUIESCENT CURRENT SYNC BUCK REGULATOR

NOTICE:

The information in this document is subject to change without notice. Users should warrant and guarantee that third

party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not

assume any legal responsibility for any said applications.

EV2149-J-00A Rev. 1.0

www.MonolithicPower.com

4

9/17/2014

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2014 MPS. All Rights Reserved.

QUICK START GUIDE

The board layout accommodates most commonly used components.

1. Connect the positive and negative terminals of the load to VOUT1, VOUT2 and GND pins,

respectively.

2. Preset Power Supply output between 2.7V and 6V, and turn off the power supply.

3. Connect Power Supply terminals to:

a. Positive (+): VIN

b. Negative (–): GND

4. Turn Power Supply on after making connections. The board will automatically start-up.

5. To use the Enable function, apply a digital input to the EN pin. Drive EN higher than 1.2V to turn

on the regulator or less than 0.4V to turn it off.

LAYOUT RECOMMENDATION OF MP2149

Proper layout of the switching power supplies is very important, and sometimes critical to make it

work properly. Especially, for the high switching converter, if the layout is not carefully done, the

regulator could show poor line or load regulation, stability issues.

For MP2149, the input capacitor and feedback resistors should be placed as close as possible to

the IC pins. As shown in Figure 4. The 0805 size ceramic capacitors (C1 and C2) are used for the

input capacitor, please make sure the two ends of the ceramic capacitor be directly connected to

PIN7 (the Power Input Pin) and PIN5 (the Power GND Pin). The R1, R2 and R3, R4 are the

feedback resistors, please make sure they are as close as possible to the feedback pins (PIN8 and

PIN1).

1

8

7

6

5

OUT1

EN2

SW1

VIN

C1A

C1B

R1

R2

AGND

SW2

OUT2

EN1

R3

R4

C3

C4

C6

C5

GND

2

3

4

Figure 4